parasitic impedance and capacitance

[pisoiu]

parasitic impedance

Does anyone have any idea about the value of the parasitic impedance and parasitic capacitance of a 0 ohm resistor in 1206, 0805 and 0603 smd package?

 

[eecly]

hi,


You can measure S-parameters of the 0R resistor using network analyzer and model it yourself by using the measurement

eecly

 

[pisoiu]

eecly, thank you. I know how I can measure it, but I do not have such equipment. My question was if somebody knows approx. values from experience/previous measurements.

 

[AL0117]

As a rule of thumb u can use the following model (I use this usually)

* Cp
* ,--------||-----------.
* | |
* | |
* | |
* | |
* | |
* o---o---L__|----((((------o----o
* | R L |
* | --
* Cs-- -- Cs
* -- |
* | |
* '--------GND----------'
typical values:
Cs 0.03-0.1 pF
Cp 0.05-0.2 pF
L 0.4-0.8 nH

rgds, Al

Sorry, the drawing doesn't look as I expected. At both pads Cs to ground, between pads series R-L, Cp in paralel to the pads